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<div class="titlepage"><div><div><h3 class="title">
<a name="spirit_x3.quick_reference.auxiliary"></a><a class="link" href="auxiliary.html" title="Auxiliary Parsers">Auxiliary Parsers</a>
</h3></div></div></div>
<div class="informaltable"><table class="table">
<colgroup>
<col>
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</colgroup>
<thead><tr>
<th>
                <p>
                  Expression
                </p>
              </th>
<th>
                <p>
                  Attribute
                </p>
              </th>
<th>
                <p>
                  Description
                </p>
              </th>
</tr></thead>
<tbody>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">eol</span></code>
                </p>
              </td>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">Unused</span></code>
                </p>
              </td>
<td>
                <p>
                  Matches the end of line (<code class="computeroutput"><span class="special">\</span><span class="identifier">r</span></code> or <code class="computeroutput"><span class="special">\</span><span class="identifier">n</span></code> or <code class="computeroutput"><span class="special">\</span><span class="identifier">r</span><span class="special">\</span><span class="identifier">n</span></code>)
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">eoi</span></code>
                </p>
              </td>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">Unused</span></code>
                </p>
              </td>
<td>
                <p>
                  Matches the end of input (first == last)
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">eps</span></code>
                </p>
              </td>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">Unused</span></code>
                </p>
              </td>
<td>
                <p>
                  Match an empty string
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">eps</span></code><code class="computeroutput"><span class="special">(</span><span class="identifier">b</span><span class="special">)</span></code>
                </p>
              </td>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">Unused</span></code>
                </p>
              </td>
<td>
                <p>
                  If <code class="computeroutput"><span class="identifier">b</span></code> is true, match
                  an empty string
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">lazy</span></code><code class="computeroutput"><span class="special">(</span><span class="identifier">fp</span><span class="special">)</span></code>
                </p>
              </td>
<td>
                <p>
                  Attribute of <code class="computeroutput"><span class="identifier">P</span></code>
                  where <code class="computeroutput"><span class="identifier">P</span></code> is the
                  return type of <code class="computeroutput"><span class="identifier">fp</span></code>
                </p>
              </td>
<td>
                <p>
                  Invoke <code class="computeroutput"><span class="identifier">fp</span></code> at parse
                  time, returning a parser <code class="computeroutput"><span class="identifier">p</span></code>
                  which is then called to parse.
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">fp</span></code>
                </p>
              </td>
<td>
                <p>
                  see <code class="computeroutput"><span class="identifier">lazy</span><span class="special">(</span><span class="identifier">fp</span><span class="special">)</span></code>
                  above
                </p>
              </td>
<td>
                <p>
                  Equivalent to <code class="computeroutput"><span class="identifier">lazy</span><span class="special">(</span><span class="identifier">fp</span><span class="special">)</span></code>
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">attr</span><span class="special">(</span><span class="identifier">attrib</span><span class="special">)</span></code>
                </p>
              </td>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">Attrib</span></code>
                </p>
              </td>
<td>
                <p>
                  Doesn't consume/parse any input, but exposes the argument <code class="computeroutput"><span class="identifier">attrib</span></code> as its attribute.
                </p>
              </td>
</tr>
</tbody>
</table></div>
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<td align="right"><div class="copyright-footer">Copyright © 2001-2018 Joel de Guzman,
      Hartmut Kaiser<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
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